<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        //柯里化思想

        //请实现以下效果
        function add (a,b,c,d) {
            return a + b + c+d
        }
        // console.log(add.length);

        // const res = add(1, 2, 3) //6

        //要求声明一个curry函数，函数add经过curry函数的处理后，每次调用只能接收一个参数
        //方法一
        const curry = (fn, ...x) => {
            return (...y) => {
                x.push(...y)
                if (x.length < fn.length) return curry(fn, ...x);
                return fn(...x);
            }
        }


        //方法二
        const curry1 = (callback) => {
            let num = callback.length;
            let res = 0;
            return function fn(a) {
                res += a;
                if (num === 1) {
                    return res
                };
                num--;
                return fn;
            }
          }

        // const newCurry = curry(add)
        // console.log(newCurry(1)(2)(3)(4));


        let addCurry = curry(add)

        // console.log(addCurry(1));
        const res2 = addCurry(1)(2)(3)(4) //6

        console.log(res2);
    </script>
</body>

</html>